This update adds support for Australian BAS (Business Activity Statement) tax returns within Odoo Enterprise. It includes new report templates and sets the most commonly used tax type as active by default, streamlining the process for Australian businesses to file their BAS returns. This ensures compliance with Australian tax regulations.

Add new BAS tax return types for Australia

Task-5416381

CE master PR: https://github.com/odoo/odoo/pull/242733
Documentation PR: https://github.com/odoo/documentation/pull/15933

This update extends the EC Sales List and Intrastat reporting capabilities to support key European markets, including Austria, Germany, Italy, Poland, Portugal, and The Netherlands. It adds specific deadlines and reporting periods for these countries, aligning with local regulations and improving compliance for businesses operating within the EU.

Following the implementation of the Tax returns feature in 18.3 which was focused on the general implementation and Belgium, we want to add the specification for other country and in this case Austria, Germany, The Netherlands, Italy, Poland, and Portugal.

Adding EC sales list, Intrastat specific deadlines and periodicities.

task-4776236

Forward-Port-Of: odoo/enterprise#97615